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Hauser bases
Hauser bases, also called Magnesium Amide Bases, are magnesium compounds used in organic chemistry as bases for metalation reactions. These compounds were first described by Charles R. Hauser in 1947.

Preparation
The Hauser bases are prepared by mixing a amine and a Grignard reagent.

R2NH + R'MgBr → R2NMgBr + R'H

Commonly used Hauser bases :
iPr2NMgBr

TMPMgBr (TMP = 2,2,6,6,tetramethylpiperidino)

Uses
Hauser bases are generaly used as metalation reagents, like organolithiums or amides. Eaton et al. first showed in 1989 the deprotonation of methyl benzoate and N,N-diethylbenzamide.